Expandable Polymer Microspheres for Mineral Flotation Separation
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Solution Overview
Problem
Conventional flotation processes for mineral separation face challenges in efficiently recovering valuable minerals due to limitations in air bubble size control and buoyancy, leading to incomplete separation and low recovery rates, particularly with larger particles and those requiring multiple bubble attachments.
Innovation Solution
The use of expandable polymer microspheres with embedded mineral collector chemistry, which expand to increase surface area for attachment and then collapse to mechanically release attached minerals, allowing for enhanced separation and recovery of valuable minerals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If air bubbles are used for flotation separation, then mineral particles can be carried to the surface, but the bubble size cannot be controlled precisely leading to incomplete separation
Solution Approach 1:
The patent changes the physical parameters of bubbles by using polymer microspheres with controlled size, density, and surface properties. The polymer microspheres have diameters of 1-100 micrometers and densities of 0.01-0.1 g/cm³, allowing precise control of bubble characteristics to improve both size control and separation efficiency
Solution Approach 2:
The patent uses composite polymer microspheres made from materials like polyethylene, polypropylene, or polystyrene with embedded mineral collector chemistry. These composite structures provide both the buoyancy needed for flotation and the chemical functionality for selective mineral attachment, resolving the contradiction between control precision and separation efficiency
2Speed
If larger air bubbles are used, then flotation speed increases, but attachment probability for mineral particles decreases
Solution Approach 1:
The patent optimizes the size parameter of flotation carriers by using polymer microspheres with diameters of 1-100 micrometers. This size range provides optimal balance between rising speed and attachment probability, with the smaller size increasing surface area for attachment while maintaining sufficient buoyancy for flotation speed
Solution Approach 2:
The patent uses spherical polymer microspheres which provide uniform surface curvature and consistent hydrodynamic properties. The spherical shape ensures predictable rising behavior and maximizes surface area for mineral particle attachment, improving both flotation speed and attachment reliability
3Manufacturing precision
If multiple air bubble attachments are required for larger particles, then separation completeness improves, but process time increases
Solution Approach 1:
The patent segments the flotation process into two distinct stages: attachment in a first cell and release in a second cell. This segmentation allows larger particles to attach to multiple polymer microsphere carriers during ascent, ensuring complete separation, while the controlled release mechanism prevents time loss by efficiently detaching minerals at the surface
Solution Approach 2:
The patent introduces polymer microspheres as intermediary carriers between the mineral particles and the flotation medium. These intermediaries provide multiple attachment sites for larger particles during ascent, ensuring complete separation, while their controlled collapse at the surface enables rapid release and prevents process time extension
4Reliability
If polymer microspheres are used to increase surface area, then attachment probability improves, but device complexity increases
Solution Approach 1:
The patent designs polymer microspheres with self-expanding capabilities through embedded blowing agents or temperature-responsive polymers. The microspheres automatically expand upon contact with the slurry or temperature change, increasing surface area for attachment without requiring external control mechanisms, thus improving attachment probability while maintaining system simplicity
Solution Approach 2:
The patent uses temperature or pH changes to control the expansion and collapse of polymer microspheres. This parameter-based control allows the system to automatically adjust microsphere surface area according to process conditions, improving attachment probability during flotation while simplifying the overall system by eliminating complex mechanical control devices
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly improves the probability of mineral attachment and release, increasing recovery rates and efficiency by controlling bubble size and buoyancy, enabling the separation of larger particles and optimizing mineral recovery.
Implementation Method 1
each comprising an interior part and a shell formed by expansion of the interior part
Implementation Method 2
The air is used to carry the material to the surface of the flotation cell. When the hydrophobic material and the air bubbles collide, they become attached to each other. The bubble rises to the surface carrying the desired material with it.
Implementation Method 3
The second cell is configured to receive the expanded polymer microsphere foam layer, to cause the expanded polymer microspheres to collapse substantially in volume into collapsed polymer microspheres having a substantially reduced sphere surface area that results in a mechanical shearing off of the attached mineral particles of interest
Data Source
AI summary
Apparatus is provided featuring a first and second cells. The first cell receives an ore slurry having mineral particles of interest, receives unexpanded polymer microspheres comprising a surface having mineral collector chemistry attached thereto with molecules for attaching the mineral particles of interest, causes the unexpanded polymer microspheres to expand substantially in volume into expanded polymer microspheres having a substantially increased sphere surface area, and provides an expanded polymer microsphere foam layer comprising the expanded polymer microspheres with attached mineral particles of interest. The second cell receives the expanded polymer microsphere foam layer, and causes the expanded polymer microspheres to collapse substantially in volume into collapsed polymer microspheres having a substantially reduced sphere surface area that results in a mechanical shearing off of the attached mineral particles of interest. The second cell may also provide a mineral concentrate output having the mineral particles of interest.